when was the first time luffy used haki

Well, there are 'luffy haki fanfic' stories that focus on the development of his Observation Haki. In some of them, Luffy is able to predict the moves of his opponents far in advance, like being able to dodge attacks that are seemingly impossible to avoid. These fanfics often add new elements to the use of his Haki, like being able to sense the emotions behind an opponent's attack as well.

In this kind of fanfiction, usually the plot might involve Luffy starting to discover his latent conqueror's haki power. Maybe he first experiences some intense battles where he unknowingly shows signs of it. Then, he might meet an old and wise character who recognizes this power in him and starts to guide him on how to control and use it effectively.

You can start by looking on fanfic websites like Archive of Our Own (AO3) or FanFiction.net. Just type 'luffy haki fanfic' into their search bars, and a whole bunch of stories should come up. These platforms have a large collection of One Piece - related fanfics, including those focused on Luffy's Haki.

If Luffy knew Haki early, it would likely give him a significant advantage. He could take on stronger opponents sooner and perhaps even prevent some of the setbacks he faced originally. This could lead to a quicker rise to power and a different dynamic with his crew.

Aside from Luffy, characters like Ace might show up in this type of fanfiction. Ace, being Luffy's brother, could have some connection to Luffy's discovery of conquerer's haki, perhaps through memories or some form of spiritual guidance. Additionally, some powerful enemies might be present. These enemies would serve as the motivation for Luffy to quickly master the conqueror's haki in order to defeat them and protect his crew. There may also be some minor characters from the One Piece world who assist Luffy in his learning process, like the inhabitants of a special village that has knowledge about haki.

In some fanfictions, Naruto might discover haki during a particularly intense battle. Maybe when facing an enemy with an unusual power that his regular jutsu can't handle, he unknowingly taps into his latent haki ability.

I'm not exactly sure when it was first used. It's a bit of a mystery and might require some in-depth research into literary history.

In some fanfictions, Luffy's Haki training often involves extreme challenges. For example, he might face powerful foes that force him to push his Haki to new limits. He could be in situations where his Observation Haki has to be sharpened quickly to avoid deadly attacks. Sometimes, he trains with new mentors in fanfic worlds who have unique ways of teaching Haki, like making him endure intense mental and physical stress to strengthen his Conqueror's Haki.

The term 'fanfiction' was first used in the late 20th century, but the exact date is hard to pinpoint precisely.

Fiction has been around for a long time. It's hard to pinpoint an exact date, but it likely emerged in ancient civilizations as people started telling imaginative stories.